TUSB8041: Measurement issues

Hi Gareth:

    It seems they pick the wrong pattern for short channel test, Cp1 should be clock signal, but from the report it was LPFS signal. It is for upstream port or downstream port?

Regadrs

Brian

Hi Brian

Thank you for your support

The measurement report is the port in the red frame

Are there AC caps  on SSTX_DN2? Did customer check test pattern?

Best

Brian

Hi 

There is a complete schematic, and SSTX has a capacitor of 104 pF

Test pattern Subsequent customers will check

USB3.0 HUB 20250102-output.pdf

They don't need Vbus for USB connector?

Best

Brian

Hi Brian

1. Vbus does the datasheet according to the datasheet, and the PIN receives the V5P_A_HUB

2. The customer now wants to send the USB2.0 eye diagram to the USB Port from the CPU (Nvidia AGX) register, but the intermediate process will go through TUSB8041, and I want to know how TUSB8041 how to turn on the TEST Mode?

1: where  is V5P_A_HUB from?

2: you need to control TUSB8041 to send USB2 HS signal. Is this Linux system or Windows system?

Best

Brian

Hi Brian

1. V5P_A_HUB as shown below

2. OS: Ubuntu 20.04.6 LTS (Jetpack 5.1.3)，CPU: Nvidia Jetson AGX

Hi Gareth:

   For Linux system, customer need to do it manually  to force it into test mode.

When the feature selector is PORT_TEST, the most significant byte (bits 15..8) of the wIndex field is the selector identifying the specific test mode. Table 11-24 lists the test selector definitions.

Best

Brian

Hi Brian

Currently, the USB2.0 test can be passed using the Test_Packet test mode, but the USB3.0 test currently fails. Is there a tool, command, or source code that can allow me to test USB3.0? My settings are as follows

uint8_t bmRequestType = 0x23, bRequest = 0x03;

test_mode =Test_Packet;

test_port=1;

libusb_control_transfer(handle,

                                                          bmRequestType,

                                                          bRequest,

                                                          wValue,

                                                          test_mode << 8 | test_port << 0,

                                                          data,

                                                          wLength,

                                                          timeout_set);

for USB3:

The “Set Port Feature: PORT_LINK_STATE = Compliance Mode” is a standard control transfer which is described in the USB3.1 specification. The Command format and required bRequest, wValue, and wIndex values are described through USB3.1 specification excerpts below.

make sure don't connect test fixture until you complete the test mode procedure.

Best

brian

Hi Brian

The picture file sent is too small and will become blurry when enlarged. Can you provide a PDF file and explain which page you are referring to?

sure, I will do it by tomorrow.